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Property and Equipment
 12 Months Ended
Dec. 31, 2021
Property, plant and equipment [abstract]  
Property and Equipment Property and Equipment
Engineering
Equipment
$		Office
Equipment
$		Leasehold
Improvements
$		Other
$		Total
$
Cost
December 31, 2019126.8 86.8 246.6 40.4 500.6 
Additions13.3 5.0 12.6 2.4 33.3 
Additions arising on acquisitions1.4 0.4 0.2 0.2 2.2 
Disposals(22.6)(6.0)(15.0)(1.7)(45.3)
Impact of foreign exchange(0.5)(0.9)(1.8)(0.7)(3.9)
December 31, 2020118.4 85.3 242.6 40.6 486.9 
Additions21.5 5.1 15.1 4.5 46.2 
Additions arising on acquisitions5.6 0.7 3.3 2.0 11.6 
Disposals(15.3)(6.7)(15.7)(3.2)(40.9)
Impact of foreign exchange(1.5)(0.8)(1.4)(0.6)(4.3)
December 31, 2021128.7 83.6 243.9 43.3 499.5 
Accumulated depreciation
December 31, 201965.3 37.9 92.7 18.2 214.1 
Depreciation17.2 8.1 29.7 2.9 57.9 
Disposals(20.5)(5.5)(14.9)(1.4)(42.3)
Impairment (note 12)— 3.2 16.3 — 19.5 
Impact of foreign exchange(0.5)(0.5)(1.1)(0.3)(2.4)
December 31, 202061.5 43.2 122.7 19.4 246.8 
Depreciation17.5 7.2 26.2 3.0 53.9 
Disposals(14.7)(5.7)(15.6)(2.5)(38.5)
Impairment net of reversal (note 12)— 1.6 4.1 — 5.7 
Impact of foreign exchange(0.8)(0.3)(0.8)(0.2)(2.1)
December 31, 202163.5 46.0 136.6 19.7 265.8 
Net book value
December 31, 202056.9 42.1 119.9 21.2 240.1 
December 31, 202165.2 37.6 107.3 23.6 233.7 

Leasehold improvements includes construction work in progress of $3.4 (2020 – $0.2) on which depreciation has not started.

Included in the Other category is automotive equipment, buildings, land, and an ownership interest in an aircraft.